Imaging through scattering media under strong background illumination based on symmetrized speckles

Imaging through scattering media is vital for biomedical and astronomical applications. While memory-effect-based methods, including speckle correlation and speckle deconvolution, are characterized by their simplicity and convenience, strong background illumination often degrades reconstruction. We propose a symmetrized speckle method based on the frequency-domain characteristics of symmetrical speckle patterns via flipping and stitching speckles. Experimental validations were conducted on both transmissive and reflective objects under background illumination from various directions. For a white light illumination scene, we additionally propose and demonstrate a blind-deconvolution modified symmetrized speckles method to solve the chromatic dispersion problem. Compared to existing techniques, our approach achieves superior reconstruction quality under diverse illumination, demonstrating unique advantages for scattering imaging.